Are you running the most current firmware for your router? If not, download it and install it and see if the problem resolves. Also, after changing IP address, restart the router, flush the DNS cache and ARP cache on any machine that are having problems.

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explorer1979Author Commented: 2007-03-30

Yes , the lastest fireware on this fireware already.....

How to flush the DNS Cache and ARP Cache?

I try to reboot the XP workstation also not work

And if I change my XP workstation's DNS IP from ISP to the Linux Server IP

The Linux server's DNS also not work, but if I change back to the ISP DNS, the Linux Server's DNS work again....